Association of race, ethnicity and insurance status with outcomes for patients with acute pulmonary embolism treated by PERT: a retrospective observational study

Background Management of PE has become streamlined with the implementation of PE Response Teams (PERT). Race, ethnicity and insurance status are known to influence the outcomes of patients with acute PE. However, whether the implementation of PERT-based care mitigates these racial and ethnic disparities remains unknown. Our aim was to assess the association of race, ethnicity and insurance with outcomes for patients with acute PE managed by PERT. Methods We performed a retrospective chart review of 290 patients with acute PE, who were admitted to one of three urban teaching hospitals in the Mount Sinai Health System (New York, NY) from January 2021 to October 2023. A propensity score-weighted analysis was performed to explore the association of race, ethnicity and insurance status with overall outcomes. Results Median age of included patients was 65.5 years and 149 (51.4%) were female. White, Black and Asian patients constituted 56.2% (163), 39.6% (115) and 3.5% [10] of the cohort respectively. Patients of Hispanic or Latino ethnicity accounted for 8.3% [24] of the sample. The 30-day rates of mortality, major bleeding and 30-day re-admission were 10.3%, 2.1% and 12.8% respectively. Black patients had higher odds of major bleeding (odds ratio [OR]: 1.445; p < 0.0001) when compared to White patients. Patients of Hispanic or Latino ethnicity had lower odds of receiving catheter-directed thrombolysis (OR: 0.966; p = 0.0003) and catheter-directed or surgical embolectomy (OR: 0.906; p < 0.0001) when compared to non-Hispanic/Latino patients. Uninsured patients had higher odds of receiving systemic thrombolysis (OR: 1.034; p = 0.0008) and catheter-directed thrombolysis (OR: 1.059; p < 0.0001), and lower odds of receiving catheter-directed or surgical embolectomy (OR: 0.956; p = 0.015) when compared to insured patients, although the odds of 30-day mortality and 30-day major bleeding were not significantly different. Conclusion Within a cohort of PE patients managed by PERT, there were significant associations between race, ethnicity and overall outcomes. Hispanic or Latino ethnicity and uninsured status were associated with lower odds of receiving catheter-directed or surgical embolectomy. These results suggest that disparities related to ethnicity and insurance status persist despite PERT-based care of patients with acute PE. Supplementary Information The online version contains supplementary material available at 10.1186/s12931-024-02872-5.


Background
Worldwide, acute pulmonary embolism (PE) is the third leading cause of vascular disease after myocardial infarction and ischemic stroke [1].The in-hospital mortality of PE averages around 6.7% but can be as high as 40% in patients with hemodynamically significant PE [2].Almost a quarter of patients with acute PE may die before they reach the hospital [3].In an effort to streamline the management of patients with acute PE, many institutions have created dedicated PE Response Teams (PERT) [4].These teams comprise multidisciplinary experts in PE management that may include pulmonologists, cardiologists, cardiothoracic surgeons and interventional radiologists.A comprehensive plan of care is formulated by PERT for each acute PE in consultation with all members of the patient care team.Preliminary evidence suggests that the management of acute PE patients by PERT improves overall patient outcomes and reduces healthcare costs [5,6].
PERT was implemented at our institution (Mount Sinai Health System in New York City, NY) beginning in 2018.The PERT consisted of the on-call pulmonologist, intensivist, cardiologist, cardiothoracic surgeon and interventional radiologist.The racial and ethnic makeup of the PERT was diverse.Clinicians included in the PERT were of different races including White, Black, Asian, Native American and Pacific Islander; a few clinicians of Hispanic or Latino ethnicity were also present.No community members were involved in the activities of PERT hitherto.Activation of a PERT consult was at the discretion of the primary attending (emergency physician, hospitalist or intensivist) taking care of the patient.The general criteria for activation of a PERT consult was the diagnosis of an acute PE, typically intermediate-or high-risk.In some cases, PERT consultation was also requested for patients with low-risk acute PE at the discretion of the treating physician.For each PERT consult, a management plan was formulated based on mutual discussion amongst all members of the PERT and the patient's treating physician.The European Society of Cardiology 2019 guidelines [7] were used as the cornerstone of management for patients with acute PE as well as for risk stratification.Based on these guidelines, patient with hemodynamic instability were defined as high risk.Patients with both evidence of right heart strain (by echocardiography or computed tomography) and positive biomarkers (troponin and/or brain natriuretic peptide), but without any hemodynamic compromise, were defined as intermediate-high risk.Patients with either positive biomarkers or signs of right heart strain-but not both-in the absence of hemodynamic compromise-were defined as intermediate-low risk.Patients who were hemodynamically stable with normal biomarkers and no echocardiographic evidence of right heart strain were deemed low risk.The on-call interventional radiologist and the on-call cardiothoracic surgeon were available at all times of the day-and during all days of the week-to perform urgent or emergent reperfusion procedures as needed.Advanced reperfusion therapies offered to patients included catheter-directed thrombolysis (CDT), catheter-directed embolectomy and surgical embolectomy.For administering CDT, percutaneous central venous access was established and bilateral pulmonary artery catheters were placed.Alteplase bolus was administered through the catheters followed by a slow continuous infusion of alteplase over 16-24 h.Fibrinogen levels were used to titrate the rate of alteplase infusion.After completion of CDT, pulmonary angiography was performed to assess if CDT was successful.Catheter-directed embolectomy was performed using the FlowTriever® (Inari Medical, Irvine, CA) device-an overthe-wire mechanical thrombectomy device-after percutaneous central venous access.Surgical embolectomy was performed via a midline sternotomy and entailed direct removal of clots from the pulmonary trunk after total cardiopulmonary bypass.General indications for surgical embolectomy were failed CDT, failed catheter-directed embolectomy, hemodynamic instability precluding percutaneous intervention and radiographic signs of probable chronic thromboembolic pulmonary hypertension.
Race, ethnicity and insurance status are strong social determinants of health [8].Racial and ethnic disparities are known to influence the outcomes of patients hospitalized with a diverse array of conditions [9][10][11][12][13].Among patients hospitalized with acute PE, race and ethnicity have also been demonstrated to have an impact on overall outcomes [14][15][16].However, whether the implementation of PERT-based care for patients with acute PE mitigates these racial and ethnic disparities remains unknown.Within the United States in general, and in the New York state in particular, people of color and those of Hispanic or Latino ethnicity have lower median income, literacy and health expectancy as compared to people of White race [17,18].These socioeconomic factors likely contribute to racial and ethnic disparities as well as potentially mediate such adverse outcomes.
In the present study, our aim was to assess the association of race, ethnicity and insurance status with overall outcomes for patients with acute PE managed by PERT.We hypothesized that the standardized management of acute PE patients through PERT would mitigate the impacts of racial group membership and insurance status on overall mortality and bleeding complications.We also explored the association of race and ethnicity with hospital length of stay (LOS) in this study.

Methods
A retrospective observational cohort study was performed after obtaining approval from the institutional review board.Patients were treated in New York City (NY) at one of three urban hospitals in the Mount Sinai healthcare system viz.Mount Sinai Morningside, Mount Sinai Beth Israel and Mount Sinai West.

Inclusion criteria
All patients diagnosed with acute PE and treated by PERT from January, 2021 to October, 2023 were eligible for inclusion in the study.PE was diagnosed by visualization of one or more filling defects within pulmonary arteries on contrast-enhanced computed tomography of the chest.

Exclusion criteria
We excluded patients who had missing data on primary outcomes (hospital LOS, survival to discharge, and rates of 30-day mortality, 30-day bleeding and 30-day re-admission).

Data collection
Eligible patients were identified by reviewing the list of PERT activations during the study period as well as by reviewing the records of patients who had an ICD-10-CM diagnosis code of pulmonary embolism.For all identified patients, the electronic health record was reviewed in a standardized and structured manner by study personnel, which entailed review of nursing observations, progress notes, radiology reports, laboratory investigations, insurance data, demographic information and biling records.This approach ensured that no bias was introduced as a consequence of differences in each personnel's style of reviewing and extracting data from patients' charts.The list of variables included included date of birth, date of admission, date of discharge, hospital LOS, disposition, location (within the hospital) of PE diagnosis, hospitalacquired PE, incidental PE, PESI score, ESC risk group, race, ethnicity, insurance, preferred language, sex, pleuritic chest pain, hemoptysis, dyspnea, syncope, altered mental status, unilateral leg pain or swelling, duration of symptoms, initial heart rate, initial temperature, initial systolic blood pressure, initial diastolic blood pressure, initial respiratory rate, initial pulse oximetry, oxygen support, body mass index (BMI), history of prior venous thromboembolism (VTE), presence of malignancy, immobility for 3 days, surgery less than 4 weeks prior, family history of thrombophilia, predisposing medications, recent long travel, active smoking, pregnancy, prior anticoagulation, history of cardiac disease, history of pulmonary hypertension, history of chronic lung disease, date and time of PE diagnosis, site of PE, RV strain by CT, RV strain by echocardiography, date and time of echocardiography, findings of echocardiography, lower extremity Doppler findings, date and time of lower extremity Doppler study, troponin I, brain natriuretic peptide, D-dimer, blood urea nitrogen, red cell distribution width (RDW) on initial presentation and discharge, creatinine, platelet count, international normalized ratio (INR), systemic anticoagulation, type of anticoagulant, inferior vena cava (IVC) filter, systemic thrombolysis, CDT, surgical or catheter-directed embolectomy, anticoagulant prescribed upon discharge, in-hospital bleeding and type of bleeding, survival to discharge, comfort care only, survival to 30 days, cause of death, 30-day bleeding and type of bleeding, 30-day re-admission, reason of re-admission, and follow-up with primary care physician, pulmonologist and hematologist.Membership in a particular racial or ethnic group was based on patients' self-description.Primary and secondary insurance status were extracted directly from the electronic health record.The first set of vital signs documented in the medical chart by nursing staff were recorded as the "initial" vital signs, while laboratory investigations recorded were the first set on the day of presentation.Data was initially recorded on standardized spreadsheets and later imported into statistical software for final analysis.
The primary outcomes assessed for this study were hospital LOS, survival to discharge, and rates of 30-day mortality, 30-day bleeding and 30-day re-admission.Each mortality was discussed at a quarterly meeting of the PERT and the cause of death was determined after a thorough review and deliberation.PE was determined to be the cause of death if patient had evidence of worsening oxygenation, worsening perfusion or electromechanical dissociation prior to death.Major bleeding was defined as bleeding that resulted in a 2 g/dl drop in hemoglobin or required transfusion of 2 units packed red blood cells or any intracranial/intraspinal bleeding.Bleeding of any severity was defined as any report of subjective bleeding by the patient or objective documentation of bleeding by a healthcare professional-irrespective of the severity of bleeding or need for treatment.Follow-up was defined as an outpatient visit within 90 days of discharge.For this measure, we included both clinicians within the Mount Sinai Health System as well as out-of-network physicians.

Statistical considerations
Statistical analysis was performed in R version 4.1.1.For all qualitative variables, frequencies were computed.For all quantitative variables, median and interquartile range (IQR) were computed.Propensity score weighting was performed using the MatchIt package for R. Propensity score was calculated from seven variables-age, sex, BMI, PESI score, ESC risk group, presence of a saddle PE and presence of malignancy-using a generalized linear model with the probit link function.Matching on the propensity score (propensity score-weighting) was performed using the optimal full matching specification, which does not place any constraints on the relative sizes of the control and treated groups [19,20].Density plots and standardized mean differences were examined to ensure the adequacy of balance within the matched dataset.Quasi-binomial regression models were used to assess the association of race (or ethnicity or insurance status) on in-hospital mortality, 30-day mortality, bleeding complications, utilization of advanced therapies and outpatient follow-up.Negative binomial regression model was used to assess the impact of race (or ethnicity or insurance status) on overall LOS.Odds ratios (OR) were computed from the quasi-binomial regression models, while incidence rate ratios (IRR) were computed from the negative binomial regression models.Cluster-robust standard errors were calculated using the marginaleffects package for R. In order to adjust for multiple comparisons, the Bonferroni correction method was applied to adopt a p-value cut-off of less than 0.0012 (= 0.05 ÷ 42) for statisticaly significance.

Association of race with clinical outcomes
For the propensity score-weighted analysis, White patients were considered as the control (reference) group as they were the largest group by number (n = 163).In the first step, optimal full matching was performed to create a propensity score-weighted dataset whereby each Black patient was paired with one or more White patients.The density plot for this matched dataset is available in the online supplement for this article (Supplementary Fig. 1).The effective sample size for this propensity scoreweighted dataset was 203.2.The results of regression analyses in the weighted dataset are detailed in Table 3. Patients of Black race had higher odds of 30-day major bleeding when compared to White patients (OR: 1.492; p < 0.0001).The hospital LOS and rates of 30-day mortality and 30-day re-admission were not significantly different for Black patients in comparison to White patients.The odds of following up in primary care, pulmonary or hematology clinics after discharge were not significantly different for Black patients when compared to White patients.
Given the scarcity of patients of races other than White (n = 163) and Black (n = 115), they were all grouped together as a single "Other" race (n = 12).In the second step, optimal full matching was performed to create a propensity score-weighted dataset whereby each "Other" race patient was paired with one or more White patients.The density plot for this matched dataset is available in the online supplement for this article (Supplementary Fig. 2).The effective sample size for this propensity scoreweighted dataset was 55.3.The results of regression analyses in the weighted dataset are detailed in Table 3. Patients of "Other" race had lower odds of receiving systemic thrombolysis when compared to White patients (OR: 0.862; p < 0.0001), although the odds of 30-day mortality were not significantly different.Moreover, patients of "Other" race had lower odds of 30-day major bleeding when compared to White patients (OR: 0.021; p < 0.0001).The hospital LOS was not significantly different for patients of "Other" race when compared to White patients.However, the odds of 30-day re-admission were Table 3 Association of race with receipt of advanced therapies and overall outcomes slightly higher for patients of "Other" race when compared to White patients (OR: 1.108; p = 0.0002).Odds of following up in hematology clinics was slightly higher for patients of "Other" race when compared to White patients (OR: 1.165; p = 0.0001), although the odds of following up in primary care or pulmonary clinics were not significantly different.

Association of ethnicity with clinical outcomes
For this analysis, patients of non-Hispanic or Latino ethnicity (n = 266) were considered as the control (reference group) and each patient of Hispanic or Latino ethnicity was paired with one or more patients in the control group using the optimal full matching specification.The density plot for this matched dataset is available in the online supplement for this article (Supplementary Fig. 3).The effective sample size for this propensity scoreweighted dataset was 114.1.The results of regression analyses in the weighted dataset are detailed in Table 4.
Patients of Hispanic or Latino ethnicity had lower odds of receiving CDT (OR: 0.966; p = 0.0003) and surgical or catheter-directed embolectomy (OR: 0.906; p < 0.0001) when compared to patients of non-Hispanic/Latino ethnicity.However, odds of in-hospital and 30-day mortality were not significantly different for Hispanic or Latino patients when compared to patients of other ethnicities.Interestingly, patients of Hispanic or Latino ethnicity had lower LOS when compared to patients of non-Hispanic or Latino ethnicity (IRR: 0.019; p = 0.0004).On the other hand, patients of Hispanic or Latino ethnicity also had lower odds of following up in pulmonary clinic when compared to patients of non-Hispanic/Latino ethnicity (OR: 0.852; p = 0.0009), although the odds of following up in primary care or hematology clinics were not significantly different.

Association of insurance status with clinical outcomes
For this analysis, patients with any insurance (n = 277) were considered as the control (reference) group and each uninsured patient (n = 13) was paired with one or more patients in the control group using the optimal full matching specification.The density plot for this matched dataset is available in the online supplement for this article (Supplementary Fig. 4).The effective sample size for this propensity score-weighted dataset was 59.6.The results of regression analyses in the weighted dataset are detailed in Table 5

Association of preferred language with clinical outcomes and interaction with race, ethnicity and insurance status
To assess if patients' preferred language had a confounding effect on the associations between clinical outcomes and race, ethnicity and insurance status, we applied Fisher's exact tests to see if the proportion of patients preferring English differed based on race, ethnicity and insurance status.The results of these tests are detailed in Table 6.The proportion of patients who preferred English were significantly different based on racial group membership (p < 0.0001) and ethnicity (p < 0.0001).
To further explore the association of preferred language with clinical outcomes, we performed another propensity score-weighted analysis.Patients who preferred English (n = 268) were considered as the control (reference) group and patients who preferred a language other than English (n = 22) were paired with one or more patients in the control group using the optimal full matching specification.The density plot for this matched dataset is available in the online supplement for this article (Supplementary Fig. 5).The effective sample size for this propensity score-weighted dataset was 90.6.The results of regression analyses in the weighted dataset are detailed in Table 7. Patients who preferred a language other than English had higher odds of receiving surgical or catheterdirected embolectomy (OR: 1.099; p < 0.0001) and had higher odds of 30-day bleeding of any severity (OR: 0.900; p < 0.0001) when compared to other patients.Moreover, the odds of in-hospital mortality were lower for patients who preferred a language other than English (OR: 0.944; p = 0.0003) as compared to other patients, although the odds of 30-day mortality and 30-day major bleeding were not significantly different.Moreover, hospital LOS, odds of 30-day re-admission and odds of following up in primary care, pulmonary and hematology clinics after discharge were not significantly different for patients who preferred a language other than English.
Patients of Hispanic or Latino ethnicity had lower odds of receiving surgical or catheter-directed embolectomy, while patients who preferred a language other than English had higher odds of receiving surgical or catheterdirected embolectomy as compared to respective control groups.This suggests that the association between ethnicity and receipt of surgical or catheter-directed embolectomy was likely not confounded by preferred language.Moreover, there were no significant associations between preferred language and 30-day mortality, 30-day major bleeding or hospital LOS.This also suggests that the association of race and ethnicity with 30-day mortality, 30-day major bleeding or hospital LOS were not confounded by preferred language.

Discussion
The results of our study demonstrated that the odds of 30-day mortality, 30 day re-admission and hospital LOS among Black patients diagnosed with acute PE-that was managed by PERT-were not significantly different when compared to those of White patients, although the odds of 30-day major bleeding for Black patients were higher.Moreover, the odds of mortality among patients of Asian and other races were not significantly different when compared to those of White patients.These results suggest that PERT-based care of acute PE patients possibly mitigated racial disparities in patient outcomes.Conversely, patients of Hispanic or Latino ethnicity had lower odds of receiving CDT and catheter-directed or surgical embolectomy when compared to non-Hispanic/ Latino patients.These results suggest that PERT-based care of acute PE patients did not mitigate ethnic disparities in patient treatment.Uninsured patients had lower odds of receiving systemic thrombolysis, CDT and catheter-directed or surgical embolectomy when compared to insured patients, although odds of 30-day mortality and 30-day major bleeding were not significantly different.
Our study cohort consisted exclusively of patients who were treated for acute PE by PERT within three large urban teaching hospitals in New York City.Our patient population was diverse with respect to ethnic and racial makeup as well as health literacy and insurance status.Moreover, the PERT itself comprised of clinicians of different races and ethnicities.The 30-day mortality of our cohort was 10.3%, while the rates of 30-day major bleeding and 30-day re-admission were 2.1% and 12.8% respectively.These results were largely concordant with the outcomes reported by other investigators for acute PE in the era of PERT-based care.Within the National PERT Consortium, Schultz and colleagues observed an overall 30-day mortality rate of 16% and 30-day rate of major bleeding of 13% [21].In another study, Rosovsky et  * p-values and odds ratios computed using multivariate quasi-binomial regression models within the propensity score-weighted sample; incidence rate ratios computed using multivariate negative binomial regression models within the propensity score-weighted sample CI = confidence interval; IQR = interquartile range; IRR = incidence rate ratio; N/A = not applicable; OR = odds ratio   5 Association of insurance status with receipt of advanced therapies and overall outcomes who were cared for by PERT and observed 30-day mortality and 30-day major bleeding rates of 5.1% and 5.7% respectively [22].Moreover, Hussein et al. reported the outcomes of 819 patients with acute PE who were cared for by PERT and found that the median hospital LOS was 5 days [23].These results were similar to those of our cohort where the median hospital LOS was 6 days.Overall, these results suggest that the quality of PERT-based care offered to patients in our cohort was largely similar to that offered by PERT at other institutions.Race and ethnicity are strongly associated with overall outcomes of patients hospitalized with acute PE [14,24].In the Nationwide Inpatient Sample (NIS), Farmakis and colleagues demonstrated that patients of races other than White had higher odds of in-hospital mortality and lower odds of receiving advanced therapies for PE [14].On the other hand, in our cohort of patients with acute PE managed by PERT, the odds of mortality for patients of races other than White were not significantly different than that of White patients.Our results were similar to those of Dronamraju et al., who observed that among 425 patients with acute PE managed by PERT, in-hospital treatment and in-hospital mortality were not significantly different between Black and White patients [25].These results suggest that PERT-based care of acute PE patients can mitigate racial disparities in treatment and overall outcomes by providing standardized care to each patient.
In our study, patients of Hispanic or Latino ethnicity had lower odds of receiving CDT and catheterdirected or surgical embolectomy when compared to non-Hispanic/Latino patients.Moreover, patients of Hispanic or Latino ethnicity also had lower odds of following up in pulmonary clinic when compared to patients of non-Hispanic/Latino ethnicity.These results were similar to the findings of Sathianathan and colleagues, who observed that in the NIS, Hispanic patients were less likely to undergo CDT [24].It is interesting to note that even though PERT-based care mitigated racial disparities in patient care in our cohort, ethnic disparities still persisted.One possible explanation may be that even for patients cared for by PERT, treatment plans that are formulated by different clinicians may not be completely standardized.Schultz and colleagues investigated the outcomes of different patients cared for by PERT within the National PERT Consortium and found that treatments delivered for acute PE and overall mortality varied greatly between PERTs at different institutions [21].
A major reason for the observed lack of a standardized management approach to PERT-based care for patients with acute PE is because the optimal therapy for high risk and intermediate risk PE remains incompletely defined.There is a paucity of randomized controlled studies comparing the efficacy and safety of different advanced therapies [26,27].Studies comparing different treatment regimens are mostly retrospective and non-randomized [28][29][30].Most studies describing the utility of advanced therapies are single-arm studies [31][32][33][34].In the absence of randomized controlled studies, there are retrospective cohort studies, systematic reviews and metaanalyses comparing different advanced therapies versus standard-of-care full dose anticoagulation mainly based on retrospective data [35].There are consensus statements offering guidelines [36,37] and there are ongoing randomized trials of CDT and catheter-directed embolectomy [38].The HI-PEITHO study is randomizing intermediate high-risk PE patients to ultrasound-assisted CDT and anticoagulation versus full-dose anticoagulation [39].Results of these on-going randomized trials may help to standardize the management of intermediate high-risk PE.
Race and ethnicity are known to be strong determinants of overall health [9][10][11][12][13]40].Recent research into race and ethnicity has underscored the arbitrariness of dividing humans into rigid groups based on a few phenotypic traits, such as hair and skin color [8].Race is not    7 Association of preferred language with receipt of advanced therapies and overall outcomes a valid biological construct as traditionally defined racial and ethnic groups are not accurate reflections of genetically distinct populations [41].Moreover, there is significant educational, economic and cultural heterogeneity within traditionally defined racial and ethnic groups [42].All these research findings dictate that racial and ethnic differences in patient outcomes are largely driven by implicit biases, poor health literacy, differences in healthcare availability, underinsurance, economic disparities and social structures [8,43].In the context of the present study, we observed that the odds of 30-day mortality among patients of different racial groups were not significantly different, presumably due to standardized care offered by PERT to patients with acute PE, which mitigated racial disparities.At the same time, patients of Hispanic or Latino ethnicity had lower odds of receiving CDT and surgical or catheter-directed embolectomy, which reflects a persistence of ethnic disparities.These ethnic disparities could be mitigated as well by attending to patient, healthcare provider, and systemic factors.
Our patient cohort included a small number of patients of Asian, Pacific Islander and Native American races, which precluded a meaningful subgroup analysis of these patients.Nevertheless, we grouped all these patients together as a single "Other" race and explored their outcomes in propensity score-weighted analyses.Patients of "Other" race had lower odds of receiving systemic thrombolysis, although their odds of receiving CDT or catheter-directed/surgical embolectomy were not significantly different.Moreover, patients of "Other" race had lower odds of major bleeding at 30-days as well as higher odds of 30-day re-admission when compared to other patients.Given the small number of events within this group of patients, it is possible that these results reflected a mere sampling bias due to skewed capturing of patients of these minor racial groups.Further research is needed to understand the impact of racial disparities on outcomes of patients belonging to racial groups other than White or Black.
Insurance status is known to significantly influence the outcomes of patients with venous thromboembolism as well as their risk for re-hospitalization following discharge [14][15][16].In our study, uninsured patients had lower odds of undergoing surgical or catheter-directed embolectomy when compared to insured patients, while the odds of 30-day mortality or 30-day major bleeding were not significantly different.Our findings were similar to those of Farmakis et al. [14], who studied 1,124,204 hospitalizations for acute PE in the NIS and found that use of advanced therapies was lower in Medicaid beneficiaries (OR adjusted : 0.68) when compared to privately insured patients.Our results were also concordant with the results reported by Zumbrunn and colleagues [15], who studied 819 elderly patients in a Swiss prospective multicenter cohort and found that insurance status was not associated with mortality or risk of recurrent VTE.On the other hand, Wadhera and colleagues [16] investigated the long-term outcomes of 53,386 Medicare beneficiaries hospitalized for acute PE and found that socioeconomically disadvantaged patients had higher 1-year mortality rates as well as higher rates of 90-day re-admission.In our study, we only assessed the 30-day mortality and re-admission rates for patients and observed no significant difference between uninsured and insured patients; however, it remains unknown if their long-term outcomes were discrepant.
Limited English proficiency has been shown to influence the outcomes of patients hospitalized with acute medical conditions as well as the post-operative outcomes of patients undergoing elective surgery [44,45].In our study, the odds of 30-day mortality and 30-day major bleeding were not significantly different for patients who preferred a language other than English as compared to those who preferred English.At our institution, language interpreters via video conferencing or telephone are available at all times of the day and all days of the week to assist in caring for patients who are not proficient in English.Interestingly, odds of receiving surgical or catheter-directed embolectomy were higher for patients who preferred a language other than English as compared to those who preferred English.These findings suggest that the association of ethnicity with receipt of advanced therapies was not influenced by preferred language.However, it should be noted that we did not specifically record use of language interpreters as part of this research study.Additionally, a patient's preference for a language other than English cannot be interpreted as signifying limited English proficiency.Therefore, further research is needed to explore the influence of limited English proficiency on outcomes of patients with acute PE managed by PERT.* p-values and odds ratios computed using multivariate quasi-binomial regression models within the propensity score-weighted sample; incidence rate ratios computed using multivariate negative binomial regression models within the propensity score-weighted sample CI = confidence interval; IQR = interquartile range; IRR = incidence rate ratio; N/A = not applicable; OR = odds ratio

Table 7 (continued)
The results of our study showed that PERT-based care may mitigate racial disparities in PE care and overall patient outcomes, although ethnic disparities still persisted in our patient cohort.While the results of our study are encouraging, there are a number of limitations that need to be borne in mind with regards to this study.Firstly, this study was performed at three urban teaching hospitals in New York City.Although patients treated at our hospitals were heterogeneous with respect to racial diversity and socioeconomic strata, we included only a small number of patients belonging to the Native Hawaiian, Pacific Islander and Alaskan Native racial groups.Therefore, it is unclear if the conclusions of our study are generalizable to those racial groups.Secondly, our study included a small proportion of patients of Hispanic or Latino ethnicity (n = 24, 8.3%) when compared to the larger group of patients of non-Hispanic/Latino ethnicity.It is unclear if this number (n = 24, 8.3%) was adequate to capture socioeconomic heterogeneity within the ethnic group of Hispanic or Latino patients.Thirdly, only a small number of patients included in our patient cohort experienced major bleeding at 30 days (n = 6), which could have underpowered our ability to detect subgroup differences.Nevertheless, the rate of 30-day major bleeding in our patient cohort was comparable to that reported by other investigators.Additionally, we could not account for lactate levels in our study as lactate levels were not uniformly checked in all patients; this could have potentially confounded the associations noted in our study.Moreover, we performed optimal full matching on a propensity score calculated from seven variables.It is possible that certain variables, which were not included in the propensity score, could have influenced the associations observed in our study.Lastly, we did not consider the economic status of the patients included in our study, which could have influenced the intra-racial variation in clinical outcomes.

Conclusion
Within a cohort of acute PE patients managed by PERT, Black race was associated with higher odds of major bleeding and slightly lower odds of 30-day mortality.In contrast, Hispanic or Latino ethnicity was associated with lower odds of receiving CDT and catheter-directed or surgical embolectomy.Uninsured patients had lower odds of receiving systemic thrombolysis, CDT and catheter-directed or surgical embolectomy when compared to insured patients, although 30-day mortality and risk of major bleeding were not significantly different.These results suggest that PERT-based care somewhat mitigates racial disparities in the management of acute PE, although ethnic disparities in patient care still remain.

Table 1
Demographic characteristics and clinical, laboratory & radiologic features of patients included in the study (n = 290)

Table 2
Details of treatment and overall clinical outcomes of patients included in the study (n = 290)

Table 4
Association of ethnicity with receipt of advanced therapies and overall outcomes al. investigated the outcomes of 228 patients with acute PE

Table 6
Association of preferred language with race, ethnicity and insurance status (n = 290) p-values and odds ratios computed using multivariate quasi-binomial regression models within the propensity score-weighted sample; incidence rate ratios computed using multivariate negative binomial regression models within the propensity score-weighted sample CI = confidence interval; IQR = interquartile range; IRR = incidence rate ratio; N/A = not applicable; OR = odds ratio *